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Work done =potential energy=mgh=8*10*2.5=200J

Given two forcesPandQ, such that |P | =P,| Q | =Q, and P = Q, acting at a point, such that square of magnitude R of resultantRofPandQis 3 P² = 3 Q². We are required to find the angle betweenPandQ.

Let the angle betweenPandQ is ∅.Then by parallelogram law of vectors we have for the resultant,that,

R² = P² + Q² + 2 P Q Cos ∅ = P² + P² + 2 P P Cos ∅= 2 P² + 2 P² Cos ∅. ……..(1)

We are given that R² = 3 P². Substituting for R²in equation 1, we get,

3 P² = 2 P² + 2 P² Cos ∅, or Cos ∅ = ½ or ∅ = 60° .

The angle between the two forces is 60° .

B is correct answer of this question

After 2sS = t^2/4S = 1m

v = dS/dtv = 2t/4v = t/2

a = dv/dta = 1/2 m/s^2

F = maF = 6*1/2F = 3N

W = F * SW = 3 * 1W = 3J

Electrical engineering is a technical discipline concerned with the study, design and application of equipment, devices and systems which use electricity, electronics, and electromagnetism

electrical engineer do? "Electrical engineers design, develop, test and supervise the manufacturing of electrical equipment, such as electric motors, radar and navigation systems, communications systems and power generation equipment, states the U.S. Bureau of Labor Statistics.

Electronic engineering(also calledelectronicsand communicationsengineering) is anelectrical engineeringdiscipline which utilizes nonlinear and activeelectricalcomponents (such as semiconductor devices, especially transistors, diodes and integrated circuits) to designelectroniccircuits, devices, VLSI devices ...

1.A convex lens can produce the complete image of the object even though half of the lens is covered .Because light rays coming from the object can be refracted from the other part of the lens.

2.Given:height of object= 4cm=h0focal length=f=20cm.u=-15cm after sign conventions.by lens formula,1/f=1/v-1/u1/v=1/f+1/u=1/20-1/15=3-4/60=-1/60v=-60cmsm=v/um=hi/ho=v/uhi=hoxv/u=4x(-60)/(-15)=8cmhi=8cm∴ Position of image is 60cm in front of lens size of image is 8cmnature of image is virtual and erect.

rate of change of velocity on every moving body is called acceleration

rate of change of velocity on every moving body is called acceleration

The Role ofLightto Sight. The bottom line is: withoutlight, there would be no sight. The visualabilityof humans and other animals is the result of the complex interaction oflight, eyes and brain. We areable to seebecauselightfrom an object can move through space and reach our eyes

Thickness of plate = t Totalmass of circularplate = MDensity of plate = M /(πr₁² t) , r₁ = 28 cm r₂= radius of cut out part= 21 cm

Mass of small circular portion cut out = volume* density =πr₂² t *(M/π r₁² t) m₂ = M r₂² / r₁²

Mass of the remaining part = m3 = M - Mr₂² / r₁² = M (r₁² - r₂²) / r₁²

Let the center of mass of remaining portion be at a distance d from the center of original full plate. From symmetry the center of mass of remaining portion lies along the line joining the center of original plate and the center of removed part.

Let Center of mass of total full plate = 0 0 = 1/M ( d * mass of remaining part + C₁C₂ * mass of removed part) 0 = d *M (r₁² - r₂²) / r₁² + 7 * M r₂² / r₁² 0 = d * (r₁² - r₂²) + 7 *r₂² d = - 7 * r₂² / (r₁² - r₂²) = - 7 * 21² / (28² - 21²) = - 7 *21 * 21/ 49*7 = - 9 cm

Center gravity of the remaining portion is 9 cm to the left of the original center of full plate on the line of symmetry. Or, it is 19 cm from the edge of remaining plate along the line of symmetry.

From the graph , the velocity of A = 15/(6-0)= 5/2 m/s

and velocity of B = 15/(6-3) = 5m/s

now velocity of A w.r.t B = Va -Vb = 2.5-5 = -2.5m/s

option B.

No, because the wrist-watch glass is small and all the legs of the spherometer cannot rest on it.

As it's a wheatstone bridgeso if R1/R2= R3/R4no current will flow through Galvanometer

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It should be connected in parallel as Please like the solution 👍 ✔️

Answer of b part is 1 and c part is 5

we can see that 6 and 2 ohm resistors are in parallel so and another 6 ohm is in series with both of themso Req. =((6×2)/(6+2))+6Req. = (12/8)+6=3/2 +6=1.5+6=7.5=15/2=7 1/2 ohm

d is the right answer

20.20 is the correct answer

sorry it is wrong

ok

we can use the lens makers formula to solve this problem. Lens makers formula is

For lens in air

1/20 = (1.5–1)(1/R1–1R2) (1/R1 - 1/R2) = 2/20 = 1/10

When lens immersed in water1/f'= (1.5/1.25 –1)(1/R1–1/R2)

1/f' = (6/5 - 1) * 1/10

1/f' = (1/5) * 1/10

f' = 50 cm

Two key facts:1.The power of a lens is the reciprocal of the focal length in meters.2. Powers are additive.

The lens with a focal length of +20 cm has a power of 1/0.2 = +5

The lens with a focal length of -20 cm has a power of 1/(-0.2) = - 5

The two lenses together have a power of 5 - 5 = 0

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First convert f in metres so lens 1 has f=0.1m and lens2 has f=0.25m.

Power of lens1 = 1/0.1 = 10D

Power of lens2 = 1/0.25 = 4D

Effective power = P1+P2 = 10D + 4D = 14D.

F1=20F2=-40we know P=P1+P2NOWP1=1/20P2=-1/40P=1/20-1/401/40ANSWER

Power will be P=1/F1+1/f2F1=20/100=0.2mand F2=-40/100=-0.4mhenceP=1/0.2-1/0.4=0.2/0.08=2.5D

The energy source of a nuclear power plant is fission reaction. In fission reaction we start with an unstable atom (uranium-235) which splits apart into two small more stable atoms. When we go from something that is really very unstable (uranium-235) to thing that is more stable (barium and krypton), energy is released.

Now to split the uranium atom we need to aggravate it, what we do is we strike a neutron into this big uranium atom, which converts it into uranium-236 from uranium -235.

Uranium-236 is super unstable atom and splits up into krypton-92 and barium-141, which are way more stable. Other than release of energy, 3 free neutrons are also released in the process.

These neutrons further strikes another 3 uranium atoms and starts up a chain reaction, helping in getting a great amount of thermal energy.

Working

It all starts with a thermal neutron striking the uranium pellet and starting the chain reaction, with release of 3 new high energy neutrons as by-products of this exothermic reaction. These neutrons strike another 3 uranium atoms, and this chain reaction keeps on increasing. Heavy water is feed into the high pressure vessel which absorbs the heat generated by the chain reaction. This water doesn’t really boil as its being heated under high pressure. This is not the ordinary water that is feed into high pressure vessel; it’s 10 times heavier than the ordinary water. The main function of this water is to slow down the high energy neutrons to the level of thermal neutron or to modify the speed of neutron, that’s why it is called moderator. When neutrons travels in heavy water (deuterium oxide) it strikes with each and every molecule of heavy water thus transferring its energy to moderator, and slows down to an optimum speed.

In nuclear power plant, the chain reaction so started is controlled by the controls rods mainly boron or cadmium rods. These rods absorb the extra neutrons thus stopping the chain reaction. Generally these rods are put in and out of pressure vessel every 10 seconds, to control the power output according to the requirement or load at the turbine.

Heated water or moderator in the pressurized vessel is then pumped to the heat exchanger. Keeping in mind moderator cannot leave the circuit as it is radioactive so the water for the heat exchange is pumped from a water source (river) and this water absorbs the heat of moderator and converts into highly pressurized steam.

This pressurized steam is first feed in a high pressure turbine which converts its pressure energy into mechanical energy, but this steam still have enough pressure energy left in it to turn a low pressure turbine, so this combined mechanical energy from both the turbines is used to turn the armature of a generator thus producing electricity.

This electricity is then stepped-up to high voltage by step-up transformer, and transmitted to the nearest power grid through transmission lines.

The steam that leaves the turbines is then condensed in a condenser. The condenser is connected to the cooling tower. The cold water from the cooling tower takes the heat from the condensed water of the condenser. The hot water in cooling tower is sprayed in air thus cooling it down, to be again pumped back to the condenser.

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Electrical energy is a form of energy resulting from the flow of electric charge. Electrical energy is the most convenient form of energy for most human uses.

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center is mass of Sphere

(I)Centre of mass of a sphere lies at its geometrical centre.

(ii) Centre of mass of a cylinder lies at its geometrical centre i.e. at the mid-point of its axis of symmetry.

(iii)Centre of mass of a ring lies at its geometrical centre.

(iv)Centre of mass of a cube lies at its geometrical centre i.e. at the point of intersection of its diagonals.

No, it does not necessary that centre of mass of a body lie inside it, because in some cases such as a ring, a hollow cylinder, a hollow sphere and a hollow cube centre of mass lies outside.